White spots on nails may be caused by injury, malnutrition, fungal infection, roundworm infection and other factors. 1. Injury: nails are subjected to excessive pressure or external blows, which will cause white spots on the nails, and when the injury is serious, there will be pain, swelling, bleeding and other symptoms. 2. Malnutrition: prolonged partiality and picky eating, resulting in the lack of vitamins and trace elements in the body, it is easy to make white spots on the nails, which may also lead to reduced immunity and body wasting. 3. Fungal infection: when there is a fungal infection in the nail area, it may destroy normal cells, which may lead to white spots on the nails, and may be accompanied by roughness, unevenness and other symptoms. 4. Roundworm infection: If white spots appear frequently on the nails of children, and are accompanied by stomach pain, grinding teeth in bed and other symptoms, there may be roundworm infection. White spots on the nails, and accompanied by other abnormal manifestations, it is recommended to consult a doctor for timely examination, to clarify the cause of the disease under the guidance of the doctor to avoid delays in the condition of the symptomatic treatment.